山东及邻区地震非均匀度与中强地震的关系

Relation between Seismic Inhomogeneous Degree and Moderate Earthquakes in Shandong and Its Neighboring Areas

结合山东及其邻区中强以上地震活动性研究，运用GL值对该区中强震前的小震活动进行时空扫描，结果发现：多数地震前1～2年，在以震中为圆心的300km范围内出现不同程度的GL值异常变化，持续时间1年左右；对应时段GL值在时间扫描上出现持续半年左右的高值异常，小震活动的这种GL值敏感特性对未来中强地震的发震时间和地点具有较好的中期预报效能。

Combined with the study of moderate seismicity in Shandong and its neighboring areas, the small earthquake activities before moderate earthquakes in the area were analyzed by time- and space-scanning of GL value （ seismic inhomogeneous degree）. It is found that： （ 1 ） one or two years before majority of moderate earthquakes, GL value shows various degrees of anomalies （about one year） in a range of 300 krn from the epicenters; （2） during anomalous periods, there appears about half a year of high value anomaly in the time scanning of GL value. These show that GL value is efficacious for the moderate-term prediction of the location of future moderate earthquake.